Brick is held at a position which is at height 2 m from the floor
Now it is released from rest and hit the floor after t = 4 s
Now the acceleration of the brick is given by



a)
Now in order to find the tension in the string
we can use Newton's law




part b)
Now for the pulley
moment of inertia=

m = 30 kg
R = 2 m
I =

I = 60 kg m^2
Now the angular speed just before brick collide with the floor
![w = (v)/(r)[\tex]</p><p>here we have</p><p>[tex]v = v_i + a* t](https://img.qammunity.org/2019/formulas/physics/college/zxye8ivdtgfqu4wm9gf0tq2blffrz8mzx6.png)

v = 1 m/s
Now we will have
L = angular momentum = I w =

L = 60 *

L = 30 kg m^2/s